Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at at Dec. 31, 2013	$ 368,968	$ 646	$ 524,953	$ (126,813)	$ (29,818)
Balance at (in shares) at Dec. 31, 2013		64,618,305
Stock-based compensation plans
Grant of restricted stock	0	$ 2	(2)
Grant of restricted stock (in shares)		196,000
Issuance of common shares, net of withholdings	(938)	$ 1	(939)
Withholdings of common shares, net of issuances (in shares)		49,545
Forfeited restricted stock	0	$ 0	0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	(267)		(267)
Forfeited restricted stock (in shares)		(8,900)
Amortization of stock awards and restricted stock	2,924		2,924
Total comprehensive income (loss)	(23,198)			29,860	(53,058)
Balance at at Dec. 31, 2014	347,489	$ 649	526,669	(96,953)	(82,876)
Balance at (in shares) at Dec. 31, 2014		64,854,950
Stock-based compensation plans
Grant of restricted stock	0	$ 2	(2)
Grant of restricted stock (in shares)		170,800
Issuance of common shares, net of withholdings	(1,310)	$ 1	(1,311)
Issuance of common shares, net of withholdings (in shares)		137,457
Forfeited restricted stock	0	$ 0	0
Stock Repurchased and Retired During Period, Shares		(1,079,167)
Stock Repurchased and Retired During Period, Value	(10,345)	$ (11)	(10,334)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	783		783
Forfeited restricted stock (in shares)		(6,900)
Amortization of stock awards and restricted stock	2,454		2,454
Total comprehensive income (loss)	25,086			41,222	(16,136)
Balance at at Dec. 31, 2015	$ 364,157	$ 641	518,259	(55,731)	(99,012)
Balance at (in shares) at Dec. 31, 2015	64,077,140	64,077,140
Stock-based compensation plans
Grant of restricted stock	$ 0	$ 2	(2)
Grant of restricted stock (in shares)		171,500
Issuance of common shares, net of withholdings	(2,300)	$ 0	(2,300)
Withholdings of common shares, net of issuances (in shares)		42,796
Forfeited restricted stock	0	$ 0	0
Stock Repurchased and Retired During Period, Shares		(4,825,545)
Stock Repurchased and Retired During Period, Value	(63,570)	$ (48)	(63,522)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	1,087		1,087
Adjustments to Additional Paid in Capital, Warrant Issued	(13,271)		(13,271)
Forfeited restricted stock (in shares)		(4,600)
Amortization of stock awards and restricted stock	3,165		3,165
Total comprehensive income (loss)	42,634			23,488	19,146
Balance at at Dec. 31, 2016	$ 331,902	$ 595	$ 443,416	$ (32,243)	$ (79,866)
Balance at (in shares) at Dec. 31, 2016	59,461,291	59,461,291